Twin valve for logomotives



Mach 11, 1930. 1 w. HANcE j 1,750,592

TWIN VALVE FOR LOGOMOTIVES `Flec'l Nov. 28. 1928 4 Sheets-Sheet l March l1, 1930. 1 vw, HANCE v1,750,592

TWIN VALVE FOR LOCOMOTIVES Filed Nov. 2s, 1928 4 sheets-sheet 2 4 sheets-sheet 3 Marh l1, 1930. w. HANcE TWIN VALVE FOR LOCOMOTIVES Filed Nov. 2s, 192e March ll, 1930. L. w. l-IANCE TWIN VALVE FOR LoconoTIvEs 4 shuts-sheet 4 Filed Nov. 28, 1928 Patented Mar. 11, 1939 UNITED STATES LAWRENCE W. HANCE, OF PHILADELPHIA,'PENNSYLVANIA TWIN VALVE FOR.LOGO1\IOTIVES Application filed November 28,1928. Serial/No. 322,542.

One object of this invention is to provide each cylinder of a locomotive with two independent valves, one being the steam valve and the other the exhaust valve. These valves,

6 in the present instance, are located side-byside and are connected to a common rockingarm so that they move in unison.

A further object of the invention is to make the exhaust valve hollow so as to allow the .steam to exhaust through the valve as well as from one end of the valve.

And a still further object is to allow steam to exhaust from both the exhaust valve chest and from one end of the steam chest. These l5 objects I attain in the following manner, reference being had to the accompanying draw ings, in which:

Fig. 1 is a side view of sufficient of a locomotive to illustrate my invention;

20. Fig. 2 is a section on the line 2 2, Fig. 1;

Fig. 3 is a sectional plan view on the line 3 3, Fig. 4; and

Fig. 4 is a sectional elevation on the line 4 4, Fizz. 3.

Referring to the drawings, 1 1 are the side frames of the locomotive. 2 is the cylinder structure, which is made in two parts 3 3a in the present instance, although the structure may be made in a single casting if deaired. 4 4 are two cylinders which overhang the frames 1 1. 5 5a are the high pressure steam inlet valve chests, and 6 6a are the exhaust steam chests.

The high pressure steam chests 5 5EL have extensions 7 7aN which are connected to the dry pipe valve of the locomotive, while the exhaust chests 6 62 are connected to the exhaust passages 8 8a which terminate in the nozzle 9, Fig. 4.

The exhaust passages 8 8aN are bifui'cated as shown in Fig. 3, forming passages 8f) 8c at either end of the cylinder structure. These passages communicate with the exhaust chests 6 6, respectively. In the present instance they also extend past the end of the live steam chests 5 5, so as to carry off any exhaust steam thatmay escape past the steam valves.

The live steam chests 5 5EL connect 50 through passages 9 9a, respectively, with spectively i The valves 11 11*, located in the livesteam .55 chests; are closedk at each end, -so that 'the steam, zwhich is admitted to the centre' of the valve chest, as shown inFig. 4, passes to the cylinder through the .passages 9 9@ at one endl offthe chest whenthey are uncovered, 50

whilethe exhaust steam'can pass from the cylindersv to lthe passages 8b 8, respectively, and' iiows with.v the steam-passingthrough the exhaust chests 6 62, respectively, 'into the common exhaust' passages 8 85.

' Each steam valve 11 11a consists of a tubular body portion 12, having a head 13 at each-end,inV which are packingrings. y A valve rod 14 extends through the valve and the valve is held by a shoulder on one portion of the rodand a nut at the end of the rod. as clearly vshown in Fig. 3.

Within the high pressure valve chests 5`5a are bushings 15,'perforated so as to allow thesteam to-low into the passages 9 9a, respectively.

The exhaust steam chest has bushings v16, perforated in line with the passages 10 10, and the exhaust valve 17 consistsof a vbody portion '18, which is open at each end, and a valve rod 19 passes through hubs 20 connected to 4the body portion by ,spiders in the' ordinary manner. The centre of the chest is not connected with the exhaust passages, but when the valve uncovers the chest, the exhaust flows directly to the passages 8b 8, not only flowingdire'ctly to vthese passages hutalso through the hollow valve.

The valve rods 14 and 19 are connected to a common cross-shaft 21, Fig. 2, and this' sha-ft is carried by a rock-shaft 22 having arms 23 which are attached to the shaft 21 adjacent the lheads ofthe rods 14 and 19.

` The rock-shaft 22 'is mounted in a suitable bracket 24 mounted on a lixed part of the locomotive. Pivotally mounted on the crossshaft 21 is a lever 25 which is connected through a link 26 to the cross-head 27 of the locomotive. and this cross-head in turn is attached to the piston rod 28. A link 29 of a lValschaert valve gear, is connected with that portion of the lever 25 beyond its pivot 21, in the present instance.

It will be seen by the above construction that the steam inlet valves are independent of the exhaust valves and are mounted in independent chests, and that the exhaust from the cylinders is free to rapidly escape not only at the end of the exhaust valve chest but also through the valve, as Well as from the uncovered passage at the opposite end of the steam inlet chest from that in which the steam is admitted to the cylinders, and both valve rods are connected to a common crossshaft, so that as the piston reciprocates the valves will reciprocate in unison.

I claim 1. The combination in a locomotive, of a cylinder; a piston therein; two valve chambers arranged side-by-side and communicating with the cylinder, one of said valve chambers being a steam inlet valve chamber and the other an exhaust valve chamber; a piston valve located in each valve chamber; means for reciprocating the two valves in unison, the exhaust valve having a central passage so that when the ports at one end of the casing are uncovered, part of the exhaust will pass through the hollow exhaust valve to the exhaust passage at the opposite end of the casing; and means Jfor operating the two valves in unison.

2. The combination of a cylinder; a piston therein; two valve chambers communicating with the piston, one valve chamber being the steam chamber and the other the exhaust chamber; a piston valve located in the steam chamber; a hollow exhaust valve located in the exhaust chamber; and independent ports leading from both ends of both chambers to the cylinder, the exhaust valve being open at each end so that when the exhaust port is uncovered at one end, the steam will iloW to the exhaust passage at the end where the port is open and through the exhaust valve to the opposite end thereof.

3. The combination in a locomotive, of a cylinder; a piston therein; two valve chambers arranged side-by-side and communicating with the cylinder, one of said valve chambers being a steam inlet chamber and the other being an exhaust chamber; two reciprocating valves in each valve chamber; and an exhaust passage extending past the ends of each of said valves; the steam valve being closed at each end, and the exhaust valve having a longitudinal passage therethrough, so that the steam will pass through the exhaust chamber and its valve and from either end of the steam chamber.

LA'WRENCE W. HANCE. 

